Defiant Sanders signals he will fight on to Democratic convention

SAN DIEGO — Bernie Sanders concluded a hurried day of campaigning Sunday by delivering a defiant rebuttal to the growing calls from some Democrats for him to drop out of the presidential race.

Rousing more than 4,000 supporters as the sun set over his rally near Qualcomm Stadium, Sanders signaled that he plans to fight on to the Democratic National Convention in Philadelphia and is far from ready to cede the nomination to his rival, Hillary Clinton, who picked up more delegates in contest...